Comprehensive hydrological and hydrogeological study of topographically closed lakes in highland Ethiopia: The case of Hayq and Ardibo

Demlie, Molla; Ayenew, Tenalem; Wohnlich, Stefan

doi:10.1016/j.jhydrol.2007.03.012

Cited by 43 publications

(42 citation statements)

References 13 publications

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“…The high Mg content is related to preferential leaching of host basalts. A typical example of such process exists in the Hayq and Ardibo lakes catchments (Demlie, 2000). In view of the general similarity of rock types drained by streams and rivers in the highland volcanics, the major ion chemistry is not significantly variable.…”

Section: Direct Recharge and Its Relation With The Regional Groundwatmentioning

confidence: 99%

Environmental isotopes and hydrochemical study applied to surface water and groundwater interaction in the Awash River basin

Ayenew

Kebede

Alemyahu

2007

Hydrological Processes

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Abstract:An environmental isotope and hydrochemical study was carried out to conceptualize the surface water and groundwater interaction and to explore the groundwater flow pattern in relation to the geological setting. More emphasis is given to the Afar Depression where groundwater is a vital source of water supply. Conventional field hydrogeological study and river discharge records support the isotope and hydrochemical analysis. The region is tectonically active, comprising rift volcanic terrain bordered by highlands. The result revealed that recent meteoric water is the major source of recharge. Three distinct groundwater zones were identified associated with the highlands, transitional escarpment and the rift. Towards the rift, the ionic concentration and isotopic enrichment (υ 2 H and υ 18°O ) increases following the groundwater flow paths, which is strongly controlled by axial rift faults. The groundwater flow converges to the seismically active volcano-tectonic depressions with internal drainage and to the Awash River. Within the Afar Depression, at least four groundwater regimen are identified: (1) fresh and shallow groundwater associated with alluvial deposits ultimately recharged by isotopically depleted recent highland rainfall and the evaporated Awash River; (2) cold and relatively younger groundwater within localized fractured volcanics showing mixed origin in axial fault zones; (3) old groundwater with very high ionic concentration and low isotopic signature localized in deep volcanic aquifers; and (4) old and hot saline groundwaters connected to geothermal systems. The study demonstrated that dependable groundwater can only be obtained from the first two aquifer types in aerially restricted zones in flat plains following river courses, local wadis and volcano-tectonic depressions. The conventional hydrogeological survey and discharge records indicate substantial channel losses from the Awash River, which becomes a more dominant source of recharge in central and lower Awash valleys.

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Section: Direct Recharge and Its Relation With The Regional Groundwatmentioning

confidence: 99%

Environmental isotopes and hydrochemical study applied to surface water and groundwater interaction in the Awash River basin

Ayenew

Kebede

Alemyahu

2007

Hydrological Processes

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“…However, the groundwater flux to a surface water body is one of the more difficult components of the water balance to measure (e.g. Harvey et al 2000;Harvey and Sibray 2001;Demlie et al 2007), particularly in geologically complex areas (Nelson and Mayo 2014;Ran et al 2014). Darcian calculations of groundwater discharge to surface water bodies are often limited by the very low hydraulic gradients in aquifers immediately adjacent to wetlands.…”

Section: Introductionmentioning

confidence: 99%

Use of a conceptual hydrogeological model and a time variant water budget analysis to determine controls on salinity in Lake Burrumbeet in southeast Australia

Yihdego

Webb

2014

Environ Earth Sci

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Lake Burrumbeet, which is located in the basalt plains of western Victoria, Australia, has a much lower salinity than other lakes in the region. To determine the factors causing the freshness of this water body, an assessment was carried out using existing geological information to reconstruct the palaeotopography beneath basalt flows, and using hydrogeological data, bore hydrographs and hydrological data together with a time variant lake water balance analysis calibrated from 1998 to 2008. The calibrated water balance of Lake Burrumbeet shows that groundwater outflow has a major influence on lake levels (31 % of water losses). The lake water budget analysis confirms that the interaction of Lake Burrumbeet with the surrounding groundwater system is volumetrically significant. Geological re-construction of the course of the buried river valley sediments (Deep Lead underlying the basalt) shows that they run directly beneath Lake Burrumbeet. Groundwater leakage into these sediments is sufficient to transfer enough salt from the lake to maintain a low to moderate lake salinity. The conceptual hydrogeological model of Lake Burrumbeet, coupled with the time variant water budget analysis, show that the difference in salinity among the lakes in the region can be explained by variations in the configuration and hydrogeological setting of the lakes, and this hypothesis provides new understanding of the relative freshness of the lake.

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“…Large lakes are also present in the northern and central highlands. Tana Lake is by far the largest in Ethiopia with its 3,600 km 2 , whereas the other highland lakes such as Hayk (23 km 2 ) (Demlie et al 2007) and Ashenge (20 km 2 ) are much smaller. The most notable river system is the Blue Nile and its tributaries, the largest of which is the Tekeze/Atbara, joining the Blue Nile in the Sudan territory.…”

Section: Geographymentioning

confidence: 99%

Geomorphological Landscapes of Ethiopia

Billi

2015

World Geomorphological Landscapes

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This introductory chapter reports about the main geographic and geomorphologic features of Ethiopia. The prevailing soil types are described and soil erosion data are reported and analyzed. A brief description of the natural vegetation is provided as well. The country's main geomorphological landscapes regions are identified as follows: (1) the northern highlands, including (i) the volcanic plug belt of Adwa, (ii) the central highlands and (iii) the southwestern highlands; (2) the Rift Valley, which consists of three main portions, namely the northern, central, and southern trunks and the Afar and Danakil depressions; (3) the southern plateau, which consists of a northern and southern sector and includes also the Ogaden tableland gently descending to Somalia and the Indian Ocean. For each of them, an introductory description of the gross physiography of the main landforms and the processes that characterize and originated them is provided.

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Comprehensive hydrological and hydrogeological study of topographically closed lakes in highland Ethiopia: The case of Hayq and Ardibo

Cited by 43 publications

References 13 publications

Environmental isotopes and hydrochemical study applied to surface water and groundwater interaction in the Awash River basin

Environmental isotopes and hydrochemical study applied to surface water and groundwater interaction in the Awash River basin

Use of a conceptual hydrogeological model and a time variant water budget analysis to determine controls on salinity in Lake Burrumbeet in southeast Australia

Geomorphological Landscapes of Ethiopia

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